Sinter \Sin"ter\, n. [G. Cf. Cinder.]

(Min.) Dross, as of iron; the scale which files from iron when hammered; -- applied as a name to various minerals.

Calcareous sinter, a loose banded variety of calcite formed by deposition from lime-bearing waters; calcareous tufa; travertine.

Ceraunian sinter, fulgurite.

Siliceous sinter, a light cellular or fibrous opal; especially, geyserite (see Geyserite). It has often a pearly luster, and is then called pearl sinter.

Source: Webster's Revised Unabridged Dictionary (1913)